package com.wn.icloud.gateway.config;

import lombok.AllArgsConstructor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.config.GatewayProperties;
import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.cloud.gateway.support.NameUtils;
import org.springframework.context.annotation.Primary;
import org.springframework.stereotype.Component;
import springfox.documentation.swagger.web.SwaggerResource;
import springfox.documentation.swagger.web.SwaggerResourcesProvider;

import java.util.ArrayList;
import java.util.List;

/**
 * @author kyy
 * @date 2019/04/22
 */
@Component
@Primary
@AllArgsConstructor
public class SwaggerProvider implements SwaggerResourcesProvider {

    public static final String API_URI = "/v2/api-docs";
    @Autowired
    private final RouteLocator routeLocator;
    @Autowired
    private final GatewayProperties gatewayProperties;

    @Override
    public List<SwaggerResource> get() {
        List<SwaggerResource> resources = new ArrayList<>();
        List<String> routes = new ArrayList<>();
        routeLocator.getRoutes().subscribe(route -> routes.add(route.getId()));
        gatewayProperties.getRoutes()
                .stream()
                .filter(routeDefinition -> routes.contains(routeDefinition.getId()))
                .forEach(routeDefinition -> {
                    routeDefinition.getPredicates()
                            .stream()
                            .filter(predicateDefinition -> "Path".equalsIgnoreCase(predicateDefinition.getName()))
                            .forEach(predicateDefinition -> {
                                String location = predicateDefinition.getArgs().get(NameUtils.GENERATED_NAME_PREFIX + "0")
                                        .replace("/**", API_URI);
                                SwaggerResource swaggerResource = swaggerResource(routeDefinition.getId(), location);
                                resources.add(swaggerResource);
                            });
                });
        return resources;
    }

    private SwaggerResource swaggerResource(String name, String location) {
        SwaggerResource swaggerResource = new SwaggerResource();
        swaggerResource.setName(name);
        swaggerResource.setLocation(location);
        swaggerResource.setSwaggerVersion("2.0");
        return swaggerResource;
    }
}
